Big Red Book | 4,245 followers on LinkedIn. Simplifying Accounts & Payroll for Ireland’s Businesses | For more than three decades, Big Red Book has helped over 35,000 Irish businesses and their accountants take the hassle out of managing accounts and payroll. As one of Ireland’s most trusted providers of financial software, we focus on what matters most to SMEs: simplicity, reliability, and local expertise. Our mission has always been clear — to deliver easy-to-use accounting and payroll solutions that make running a business smoother, smarter, and fully compliant with Irish regulations.